U.S. patent application number 10/345060 was filed with the patent office on 2004-07-15 for led lighting system.
This patent application is currently assigned to LUMINATOR HOLDING, L.P.. Invention is credited to Berman, George, Graves, Jerry Haden, Gunter, John Bartholomew.
Application Number | 20040135522 10/345060 |
Document ID | / |
Family ID | 32711869 |
Filed Date | 2004-07-15 |
United States Patent
Application |
20040135522 |
Kind Code |
A1 |
Berman, George ; et
al. |
July 15, 2004 |
Led lighting system
Abstract
A lighting device that can generate light of variable color and
intensity under processor control is described. Multiple lighting
devices can be incorporated into a lighting system to illuminate
larger areas. Each lighting device may have a modular architecture
in which a lighting module is coupled to one or more additional
modules that provide power and control the operation of the
lighting module. The lighting module includes three groups of LEDs
each of which generates light of a different color whose intensity
can be controlled. In one version, the colors of the three groups
are green, red and blue and the LEDs are arranged in a line in a
repeating pattern. A lighting system can be formed by coupling
multiple lighting devices to a central controller comprising an
operator interface panel and an interface to an external computer.
The external computer can be provided with programming tools that
allow the creation of lighting programs for controlling the
operation of the lighting system. The lighting programs developed
on the external computer can then be downloaded to the central
controller which then carries out the downloaded programs in
conjunction with the lighting devices coupled thereto. A user can
select programs or modify the operation of the lighting system from
the operator interface panel provided at the central controller. A
user can also control the operation of the lighting system directly
from the external computer while it is coupled to the central
controller. Procedures are provided for calibrating the color and
power output of each lighting device.
Inventors: |
Berman, George; (Plano,
TX) ; Graves, Jerry Haden; (Valley View, TX) ;
Gunter, John Bartholomew; (Flower Mound, TX) |
Correspondence
Address: |
DARBY & DARBY P.C.
P. O. BOX 5257
NEW YORK
NY
10150-5257
US
|
Assignee: |
LUMINATOR HOLDING, L.P.
|
Family ID: |
32711869 |
Appl. No.: |
10/345060 |
Filed: |
January 15, 2003 |
Current U.S.
Class: |
315/291 ;
315/185S; 315/224; 362/800 |
Current CPC
Class: |
Y10S 362/80 20130101;
H05B 45/46 20200101; H05B 45/325 20200101; H05B 45/20 20200101;
H05B 45/40 20200101; H05B 45/22 20200101 |
Class at
Publication: |
315/291 ;
315/224; 315/185.00S; 362/800 |
International
Class: |
G05F 001/00 |
Claims
What is claimed is:
1. A light emitting diode (LED) lighting device comprising: a first
group of LEDs of a first color; a second group of LEDs of a second
color; and a third group of LEDs of a third color; wherein: each
group of LEDs comprises a plurality of LED strings coupled in
parallel, each LED string comprising one or more LEDs coupled in
series, and the first, second and third groups of LEDs are arranged
substantially along a line so that LEDs of the same LED string are
separated by one or more LEDs of a different LED string.
2. The LED lighting device of claim 1, wherein: each LED string has
a forward voltage that is a function of the number of LEDs in the
LED string; and the number of LEDs in each LED string is selected
so that the forward voltages of all LED strings are substantially
the same.
3. The LED lighting device of claim 2, wherein at least one of the
first, second and third groups of LEDs includes a ballast LED.
4. The LED lighting device of claim 1, wherein the first, second
and third colors are selected from the group of colors consisting
of red, orange, green and blue.
5. The LED lighting device of claim 1, wherein the first, second
and third colors have respective wavelengths that are at least 30
nm apart.
6. The LED lighting device of claim 1 comprising: a control
circuit, the control circuit being coupled to each of the groups of
LEDs and comprising a data interface, wherein the control circuit
independently controls each group of LEDs in accordance with data
received at the data interface.
7. The LED lighting device of claim 6, wherein the control circuit
includes: a processor, the processor being coupled to the data
interface; a controllable current source for each group of LEDs,
the controllable current source being controlled by the
processor.
8. The LED lighting device of claim 7, wherein the control circuit
includes: a current monitor for each group of LEDs, the current
monitor monitoring the current through its respective group of LEDs
and providing a reading of the current to the processor.
9. The LED lighting device of claim 6 comprising: a power circuit,
the power circuit being coupled to each of the groups of LEDs and
to the control circuit.
10. The LED lighting device of claim 9, wherein the power circuit
includes a variable power supply, the variable power supply
generating a voltage whose magnitude is controlled by the
processor.
11. A lighting system comprising the LED lighting device of claim 1
and a central controller coupled to the LED lighting device.
12. The lighting system of claim 11, wherein the central controller
includes: an operator interface panel; a computer interface; and a
switch for selectively coupling the operator interface panel and
the computer interface to the LED lighting device.
13. The lighting system of claim 11 comprising an additional LED
lighting device.
14. A method of calibrating power provided to one or more light
emitting diodes (LEDs), wherein a voltage is applied across the one
or more LEDs, the method comprising the steps of: measuring a
current through the one or more LEDs; comparing the measured
current to a predetermined current level; adjusting the voltage in
accordance with the comparison.
15. The method of claim 14, wherein the adjusting step includes
increasing the voltage if the measured current is less than the
predetermined current level.
16. The method of claim 14, wherein the measuring step includes
measuring a voltage across a known resistance in series with the
one or more LEDs.
17. A method of calibrating a color of light formed by a
combination of light emitted by a plurality of light emitting
devices of at least three different colors, the method comprising
the steps of: measuring first and second parameters of the combined
light; comparing the first and second parameters to first and
second desired ranges of values, respectively; adjusting the light
emitted by the plurality of light emitting devices so that the
measured first and second parameters are within the first and
second desired ranges of values, respectively.
18. The method of claim 17, wherein the first and second parameters
are color rendering index (CRI) and correlated color temperature
(CCT).
19. The method of claim 17, wherein the first and second parameters
include tristimulus values.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to lighting systems employing
multiple light emitting diodes (LEDs) to generate light whose color
and intensity can be varied under computer control.
BACKGROUND INFORMATION
[0002] It is well known that light of different colors,
particularly the primary colors red, blue and green, can be
combined in various proportions to generate light having a wide
variety of colors, including white light. It is also well known to
use light emitting diodes (LEDs) for such a purpose. The intensity
of light emitted by an LED can be varied by pulse width modulating
(PWM) the power applied to the LED. The application of power to an
LED or group of LEDs can be controlled by a PWM control signal
generated by a microcontroller or the like. The microcontroller can
be programmed to control multiple groups of LEDs, each generating
light of a different primary color. By controlling the intensity of
light generated by each color group of LEDs, the microcontroller
can thus control the LEDs to generate a combined light of a
specified color and intensity. The microcontroller can carry out
such an operation in accordance with a variety of data inputs from
sources such as a central controller, a user interface, a
measurement device or the like.
SUMMARY OF THE INVENTION
[0003] The present invention is directed to an improved lighting
device that can generate light of variable color and intensity
under processor control. Multiple lighting devices can be
incorporated into a lighting system to illuminate larger areas.
[0004] In an exemplary embodiment, a lighting device in accordance
with the present invention comprises a lighting module which is
coupled to one or more additional modules that provide power and
control the operation of the lighting module. The lighting module
includes three groups of LEDs each of which is comprised of LEDs of
the same color. The colors of the three groups are green, red and
blue and the LEDs are arranged in a line in a repeating pattern of
green, red, green, blue, green, red, green and red.
[0005] In a further aspect of the present invention, a lighting
system is formed by coupling multiple lighting devices to a central
controller comprising an operator interface panel and an interface
to an external computer. The external computer can be provided with
programming tools in accordance with the present invention that
allow the creation of lighting programs for controlling the
operation of the lighting system. The lighting programs developed
on the external computer can be downloaded to the central
controller which then carries out the downloaded programs in
conjunction with the lighting devices coupled thereto. A user can
select programs or modify the operation of the lighting system from
the operator interface panel provided at the central controller. A
user can also control the operation of the lighting system directly
from the external computer while it is coupled to the central
controller.
[0006] The present invention also provides methods for calibrating
the color and power output of each lighting device.
[0007] These and other aspects of the present invention will be
described below in greater detail.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is schematic representation of an exemplary
embodiment of a lighting device in accordance with the present
invention.,
[0009] FIG. 2 shows the linear arrangement of LEDs on a lighting
module of an exemplary embodiment of a lighting device in
accordance with the present invention.
[0010] FIG. 3 shows a more detailed schematic representation of an
exemplary embodiment of a lighting device in accordance with the
present invention.
[0011] FIG. 4 shows the control signal, common cathode voltage and
common cathode current for a group of LEDs of an exemplary
embodiment of a lighting device in accordance with the present
invention.
[0012] FIG. 5 shows an arrangement for an exemplary color
calibration method in accordance with the present invention.
[0013] FIG. 6 shows a chromaticity diagram for illustrating the
exemplary color calibration method of the present invention.
[0014] FIG. 7 shows a block diagram of an exemplary embodiment of a
lighting system in accordance with the present invention.
[0015] FIGS. 8A and 8B show an exemplary embodiment of an operator
interface panel of a lighting system in accordance with the present
invention.
[0016] FIG. 9 shows an exemplary display of a user interface for
programming a lighting system in accordance with the present
invention.
[0017] FIGS. 10A through 10E illustrate various lighting transition
modes of an exemplary embodiment of a lighting system in accordance
with the present invention.
[0018] FIG. 11 shows a first exemplary embodiment of a lighting
device in accordance with the present invention.
[0019] FIG. 12 shows a cross-sectional view of the device of FIG.
11.
[0020] FIG. 13 shows a second exemplary embodiment of a lighting
device in accordance with the present invention.
[0021] FIG. 14 shows a cross-sectional view of the device of FIG.
12.
[0022] FIG. 15 shows a cross-sectional view of an aircraft
passenger cabin illustrating the placement of lighting devices of
the present invention within the aircraft passenger cabin.
[0023] FIGS. 16A through 16C show cross-sectional views of three
exemplary reflector arrangements of a lighting module of a lighting
device of the present invention.
[0024] FIGS. 17A and 17B show how a ray of light is affected by two
exemplary lens arrangements.
DETAILED DESCRIPTION
[0025] FIG. 1 shows a block diagram of an exemplary embodiment of a
lighting device 100 in accordance with the present invention. In
the exemplary embodiment shown, the lighting device 100 comprises a
lighting module 10, a control module 20 and a power module 30. The
lighting, control and power modules can be combined into one or
more modules and may be implemented on one or more circuit boards.
The lighting device 100 need not be modular at all.
[0026] The lighting module 10 comprises a plurality of light
emitting diodes (LEDs) each of which emits green, red or blue
light. Naturally, other combinations of colors are possible within
the scope of the present invention. For example, green, orange and
blue LEDs may be used. In yet a further embodiment, any three
colors whose wavelengths are separated by at least some minimum
wavelength difference (for example 30 nm) can be used. Furthermore,
as can be understood by a person of ordinary skill in the art,
aspects of the present invention are applicable to systems with
LEDs of any number of different colors including single-color LED
applications.
[0027] Physically, the LEDs are arranged substantially along a line
in a repeating pattern of green, red, green, blue, green, red,
green and red. This arrangement is illustrated in FIG. 2.
Electrically, the LEDs are grouped by color, wherein the cathodes
of the LEDs of a particular color are coupled to a common terminal
11, 12 or 13. The anodes of all of the LEDs are coupled to a common
power terminal 14. As can be understood, each of the terminals
11-14 can be implemented using multiple terminals as may be
required for current carrying capacity but are described as single
terminals for the sake of simplicity.
[0028] As shown in FIG. 1, each group (G) of LEDs is comprised of
one or more parallel strings (S) of LEDs. Each LED string comprises
one or more LEDs connected in series. All of the LEDs within a
string preferably emit the same color light. The common cathode of
each group of LEDs is coupled to a respective current source 21,
22, and 23 on the control module 20. The common anode of all LEDs
on the LED module 10 is coupled to a power supply 35 on the power
module 30. The current through each group of LEDs is determined by
the respective current source 21-23, each of which is under the
control of a control circuit 25 on the control module 20. When on,
each of the current sources 21-23 sinks a current that is regulated
to be substantially constant. Naturally, as can be readily
understood, the polarity of the LEDs and of the power supply and
the direction of current flow can be reversed in an alternative
embodiment. The control and power circuitry will be described in
greater detail below.
[0029] The number of LEDs in each string is selected so as to
substantially equalize the voltage drop across the multiple LED
strings of the LED module. By equalizing the voltage drops across
the multiple LED strings, the amount of power wasted in the control
module is reduced, thereby improving the efficiency of the
device.
[0030] Because LEDs of different colors have different forward
voltage drops, the preferred number of LEDs in each string depends
on the color of the LEDs in that string. Thus, for example, where
green and blue LEDs each have a forward voltage drop of
approximately 3.2 volts, a string of eight green or blue LEDs will
have a voltage drop of approximately 25.6 volts. A string of 12 red
LEDs, each of which has a forward voltage drop of 2.1 volts, will
have a voltage drop of 25.2 volts.
[0031] In an exemplary embodiment, the LED module 10 includes 192
LEDs arranged linearly along a board which is 12.4" long. The 192
LEDs include 96 green LEDs, 72 red LEDs and 24 blue LEDs physically
arranged in the repeating pattern of green, red, green, blue,
green, red, green and red. The 96 green LEDs are electrically
arranged in 12 strings of eight LEDs each; the 72 red LEDs in six
strings of 12 LEDs each; and the 24 blue LEDs in three strings of
eight LEDs each.
[0032] In another exemplary embodiment, an LED module 10 with a
board that is 11 inches long has 160 LEDs: 80 green LEDs, 60 red
LEDs and 20 blue LEDs physically arranged in the aforementioned
repeating pattern of green, red, green, blue, green, red, green and
red. As in the previously described embodiment, each string of red
LEDs includes 12 LEDs, whereas each string of green or blue LEDs
includes eight LEDs. In the case of the blue LEDs, four "ballast"
LEDs are added to the 20 LEDs so as to form three full strings of
eight LEDs each. The ballast LEDs are obscured so that the light
they emit is not combined with that of the other LEDs and thus does
not disturb the color emission balance of the lighting module. By
thus utilizing ballast LEDs, any combination of LEDs can be
arranged in voltage-equalized strings of LEDs while also providing
the desired color emission balance.
[0033] The ballast LEDs can be obscured by a variety of means, such
as by placing them on the side of the circuit board opposite to
that on which the other LEDs are placed and/or by applying a dark
paint over their emitting surfaces. In order to avoid dark spots in
the emission of the LED module, the ballast LEDs preferably are not
placed along the line of LEDs whose emissions are visible.
[0034] Because different LEDs can have different forward voltages,
even if of the same color, some strings of LEDs may not be as
bright as other strings of LEDs. To avoid the appearance of dark or
bright spots along the row of LEDs, it is desirable to distribute
the LEDs of the same string as widely as possible over the LED
module. For example, LEDs of the same string must be at least N
LEDs apart, where N is at least one.
[0035] Physically distributing the LEDs of the same string across
the LED board also has the benefit of minimizing the perceived
effect of an LED burning out. When an LED burns out, the current in
the string in which the LED is coupled is interrupted and all of
the LEDs in that string turn off. The LEDs of the same color that
are in other strings, however, become brighter as the same amount
of current is now shared by fewer LEDs of the same color. By widely
distributing the LEDs of each string over the board, the brighter
LEDs will compensate for the inactive LEDs and the perception of
any bright or dark spots will be minimized.
[0036] FIG. 3 shows a block/schematic diagram of an exemplary
embodiment of a lighting device 100 in accordance with the present
invention. FIG. 3 shows in greater detail the control circuitry for
one color group 110 of LEDs. The control circuitry for the
remaining color groups is similar and has been omitted for
clarity.
[0037] The control circuitry, which resides on the control module
20, includes a microcontroller 200 which operates in accordance
with a program stored in a memory device (not shown or incorporated
in microcontroller 200). The microcontroller 200 may be a
single-chip device which includes a CPU and one or more of a random
access memory (RAM), read-only memory (ROM) for program storage,
non-volatile memory such as EEPROM for storing parameters or
settings, one or more digital-to-analog converters, one or more
analog-to-digital converters, one or more pulse-width modulators, a
serial communications interface, and various other auxiliary
functions, such as timers, counters, interrupt handlers and the
like. These function can be implemented in one integrated circuit
(IC) or with several ICs and discrete components. In an exemplary
embodiment, the microcontroller 200 is implemented with a
TMS320LF2406A 16-bit Digital Signal Processor (DSP) IC from Texas
Instruments of Dallas, Tex.
[0038] The microcontroller 200 includes a bidirectional serial data
interface for communicating with a central controller 700
(discussed in greater detail below). Over this interface, the
microcontroller 200 can receive commands from the central
controller 700 specifying the state of operation of each LED group
of the device 100. In an exemplary embodiment, the central
controller 700 specifies the duty cycle of the power applied to
each LED group (thereby specifying the brightness of the light
emitted by each LED group and thus the color of the combined light
as well.) In response, the microcontroller 200 controls the LED
groups accordingly. In an exemplary embodiment, the data interface
can be compliant with the RS-485 protocol. In other embodiments,
the data interface can alternately be a parallel interface. The
data interface may also be wireless (e.g., infrared, radio
frequency, etc.)
[0039] In the exemplary embodiment shown, the microcontroller 200
includes three on-chip pulse width modulation (PWM) generators,
each of which generates a pulse-width modulated signal which is
used to control a respective color group of LEDs. The on-chip PWM
generators operate in accordance with internal registers under
software control. Once the appropriate registers have been set, the
PWM generators carry out the generation of the respective control
signals without involving the CPU, thus freeing the CPU to perform
other functions. Naturally, as can be understood by a person of
ordinary skill, other implementations are also possible within the
scope of the present invention, including, among others, a
CPU-intensive bit-banging implementation, or an interrupt-driven
implementation using one of the internal timers. The PWM generators
can also be implemented with dedicated hardware and controlled by
the microcontroller 200.
[0040] A control circuit 210 controls the activation of LED color
group 110 under the control of the microcontroller 200. The control
circuit 210 acts as a constant current source which can be switched
on or off by the respective PWM control signal (PWMn) generated by
the microcontroller 200. FIG. 4 shows the voltage at the common
cathode of the LED color group 110, Vcathode, and the current
through the common cathode of the LED color group 110, Icathode,
with respect to the PWM control signal generated by the
microcontroller 200. As described above, the anodes of all LEDs are
coupled together at a common anode. The voltage at the anode,
Vanode, is coupled via the control module 20 to the regulated power
supply output voltage Vreg.
[0041] As shown in FIG. 4, when the PWM control signal is in the ON
state (in the illustrated case a logic "1" or high), the LEDs of
the color group are turned on as the cathode voltage drops to Vlit
and the cathode current rises to Ilit. When the PWM signal is in
the OFF state, the LEDs of the color group are turned off, as the
cathode voltage rises to Vdark and the cathode current drops to
Idark.
[0042] In an exemplary embodiment of the present invention, the
control circuit 210 operates so that when the LEDs of the group 110
are dark, or not emitting any perceptible light, the LEDs are
nonetheless conducting some current so that the combined current
for the group 110, Idark, is greater than zero, as shown in FIG. 4
This causes the common cathode voltage Vdark to be less than the
anode voltage since there is a voltage drop across each LED in the
group. In a conventional arrangement in which the LEDs do not
conduct at all when off, Vdark would be higher, substantially equal
to the anode voltage. By thus reducing the amplitude of the cathode
voltage swing between the active (or lit) and inactive (or dark)
states of the LEDs, the stress to which the LEDs are subjected is
reduced, thereby increasing their longevity. Furthermore, the slew
rate of the voltage transition between the active and inactive
states is reduced, thereby reducing the high frequency components
in the voltage signal and thus the electrical noise emitted by the
lighting device of the present invention.
[0043] The magnitude of the cathode current in the lit state, Ilit,
is controlled by the microcontroller 200 via a digital-to-analog
(D/A) converter 225. The output of the D/A converter 225 is coupled
to a buffer 227 whose output controls a voltage-controlled current
source comprising an operational amplifier (op-amp) 230, a MOSFET
235 and resistors R1-R4.
[0044] The amount of current conducted by the MOSFET 235 is
controlled by the voltage applied to the non-inverting input of the
op-amp 230 so that the larger the input voltage, the greater the
current. Icathode, the current conducted by the MOSFET 235, is
substantially equal to the voltage at the non-inverting input of
the op-amp 230 divided by the value of R4.
[0045] A MOSFET 229 is arranged at the output of the buffer 227 so
that when the PWM control signal is low (logic 0), the MOSFET 229
is off and the voltage generated by the buffer 227 is provided
unattenuated to the non-inverting input of the op-amp 230. This
causes the current through the MOSFET 235 to be Ilit.
[0046] When the PWM control signal is high (logic 1), the MOSFET
229 turns on, shunting the output of the buffer 227 through R5 to
ground and attenuating the voltage at the non-inverting input of
the op-amp 230. This causes the current through the MOSFET 235 to
be Idark. The value of Ilit is substantially equal to the
unattenuated voltage at the output of the buffer 227, which is set
by the microcontroller via the D/A converter 225, divided by the
value of R4. The microcontroller 200 can set the value of Ilit in
accordance with the number of LED strings in the respective LED
group 110. This allows the use of LED modules 10 of different sizes
(i.e., different numbers of LED strings) with the same control
module 20. The microcontroller 200 can also set the value of Ilit
to calibrate the power provided to the LEDs.
[0047] The value of Idark is substantially equal to the voltage at
the output of the buffer 227 attenuated by the combination of R5
and the conducting resistance of MOSFET 229, divided by the value
of R4. As discussed above, Idark is selected so as to reduce the
noise generated by the switching of the LEDs and to reduce the
switching stresses on the LEDs. As with Ilit, the microcontroller
200 can control the value of Idark by controlling the voltage at
the output of the buffer 227 via the D/A 225.
[0048] In an exemplary embodiment, the current through each LED
string when lit is substantially 40 mA. In the case of a 12.4" long
LED module with 96 green LEDs organized in 12 strings of eight LEDs
each, the microcontroller 200 controls the voltage-controlled
current source 210 to sink a cathode current of 12.times.40 mA, or
480 mA, when the green LEDs are on. Thus the desired value of Ilit
is 480 mA. With R4 having a resistance of 1.25 ohm, the voltage at
the output of the buffer 227 should be 1.25.times.0.480=0.600
volts. Therefore, the microcontroller 200 is programmed so that
when a 12.4" LED module 10 with 96 green LEDs is coupled to the
control module 20, the microcontroller 200 controls the D/A
converter 245 to generate a voltage of 0.600 volts at the output of
the buffer 227, which in turn causes the MOSFET 235 to conduct a
current of 480 mA. The 480 mA current is shared by 12 strings of
LEDs, each string conducting 40 mA, as desired.
[0049] In an exemplary embodiment in which the MOSFET 229 has a
conducting resistance of 4 ohms and the resistor R5 has a value of
20 kohms, the output of the buffer 227 is attenuated to 1 mV at the
input to the op-amp 230. If the op-amp 230 has an input bias offset
voltage of approximately 0.360 mV, Idark is approximately:
(1 mv+0.360 mV)/1.25 ohm=1.088 mA.
[0050] Distributed over 12 strings, each string conducts 1.088
mA/12=90 .mu.A.
[0051] The current through the common cathode of the LED color
group 110 is monitored by the microcontroller 200 via an
analog-to-digital (A/D) converter 240. The input of the A/D
converter 240 senses the voltage across R4, which is substantially
proportional to the cathode current. The microcontroller 200
monitors the cathode current of each LED color group using a
similar arrangement for each group. The microcontroller 200 uses
the current information in performing a power calibration procedure
described below.
[0052] In an exemplary embodiment of a lighting device in
accordance with the present invention, one control module 20 can be
coupled to and control multiple lighting modules 10. In this case,
the control circuitry 210 is replicated for each LED group. For
example, in an exemplary embodiment with three LED modules 10, the
control module 20 will have nine groups of LEDs. The TMS320LF2406A
DSP is well suited in this case for use as the microcontroller 200
as it includes nine, on-chip PWM generators as well as multiple A/D
converters that can sample the nine current sensing points in such
a device.
[0053] In a further aspect of an exemplary embodiment of the
present invention, the power module 30 comprises a variable power
supply 300. The power supply 300 takes in a voltage Vin from the
central controller 700 and generates a regulated DC voltage Vreg
which can be varied in accordance with a control voltage Vcontrol.
Vcontrol is generated on the control module by a D/A converter 245
coupled to the microcontroller 200. The microcontroller can thus
control the regulated output of the power module 30 over a given
range. The regulated output of the power module 30 is routed via
the control module 20 to the LED module 10 as the common anode
voltage, Vanode. (Naturally, Vreg can alternately be directly
coupled from the power module 30 to the common anode of the LED
module 10.)
[0054] In an exemplary embodiment, Vin is nominally 28 volts DC and
Vreg can be 23 to 33 volts DC. The variable power supply 300 can be
implemented in a conventional way.
[0055] As described above, the microcontroller 200 can measure the
cathode current for each LED color group as well as control the
common anode voltage Vanode. The microcontroller 200 can be
programmed to use these capabilities to carry out a power
calibration procedure in accordance with the present invention. In
an exemplary procedure, the microcontroller 200 initially sets
Vanode (Vreg) close to the bottom end of its range of
adjustability, e.g., 24 volts. The microcontroller 200 then turns
on each LED group and measures the common cathode current for each
LED group. If the cathode current for each LED group is not at
least some minimum predetermined current for that group, the
microcontroller 200 then adjusts the Vcontrol to increase Vanode by
at least some predetermined increment, e.g., 0.25 volts. The
minimum predetermined current for each LED color group is equal to
a minimum predetermined current for each string of LEDs multiplied
by the number of LED strings of that color group. In an exemplary
embodiment, the average- current through each LED string is 40 mA,
with a variation of .+-.10%; i.e., a minimum current of 36 mA and a
maximum of 44 mA. If there are 12 strings in the green LED group,
for example, the minimum current for the green LED group is
36.times.12 or 432 mA. Similarly, for six strings of red LEDs and
three strings of blue LEDs, the minimum currents would be 216 mA
and 108 mA, respectively. If in this exemplary arrangement the
microcontroller 200 does not sense at least 432 mA, 216 mA and 108
mA in the green, red and blue LED groups, respectively, the
microcontroller will then increase Vanode and re-measure the
cathode currents of each group, as before. The microcontroller 200
repeats this iterative process until the aforementioned minima are
met or exceeded for all three LED color groups.
[0056] An exemplary method of calibrating the color emitted by a
lighting device of the present invention will now be described with
reference to FIGS. 5 and 6. FIG. 5 shows an exemplary calibration
setup in which a lighting device 100 to be calibrated emits light
which is detected by a spectro-radiometer 520. The
spectro-radiometer 520 determines the color rendering index (CRI)
and the correlated color temperature (CCT) of the light detected.
The spectro-radiometer 520 is coupled to a calibration controller
550 which is in turn coupled to the lighting device 100 via the
above-described data interface. The calibration controller 550 may
comprise a personal computer with the appropriate software and
interfaces for interacting with the spectro-radiometer 520 and the
lighting device 100.
[0057] In an exemplary method of the present invention, the
calibration controller 550 initially controls the lighting device
100 to generate white light by specifying the appropriate duty
cycles with which the red, blue and green LEDs of the lighting
device 100 are to be energized in order for their combined output
to appear as white light. In an alternate embodiment, the
calibration controller 550 initially controls the lighting device
100 to generate all three colors with maximum intensity: i.e., the
duty cycle specified for each of the red, green and blue LED groups
is at its maximum value.
[0058] The spectro-radiometer 520 then determines the CRI and CCT
of the light emitted by the lighting device 100 and communicates
those results to the calibration controller 550. The calibration
controller 550, in turn, determines whether the measured CRI and
CCT are acceptable. In an exemplary embodiment, a CRI of 60 to 100
is considered acceptable and a CCT of approximately 4000 Kelvin is
sought. If not acceptable, the calibration controller 550 adjusts
the duty cycles of the red, green and blue LEDs of the lighting
devices. The light output of the device 100 is measured again and
the process is repeated until the CCT and CRI values measured fall
within the above-mentioned ranges.
[0059] The spectro-radiometer 520 may also determine the components
of the color of the light generated by the device 100 which
components can be used in an alternate color calibration procedure.
FIG. 6 shows a chromaticity diagram which helps illustrate the
color calibration process of the present invention. The
chromaticity diagram of FIG. 6 is an x, y chromaticity diagram
which projects the cone of visible light onto the x, y tristimulus
plane. A region 650 of the chromaticity diagram represents white
light. The region 650 surrounds the black body curve 625. The white
light output desired falls within a predetermined target area 675
within the region 650 on or near the curve 625.
[0060] In an exemplary calibration procedure of the present
invention, the calibration controller 550 initially controls the
lighting device 100 to generate all three colors with maximum
intensity. The spectro-radiometer 520 then determines the x and y
tristimulus components (i.e., the location on the chromaticity
diagram of FIG. 6) of the light emitted by the lighting device 100
and communicates those results to the calibration controller 550.
The calibration controller 550, in turn, determines whether the
measured x and y components represent a point within the
predetermined target area 675. If not, the calibration controller
550 adjusts the duty cycles of the red, green and blue LEDs of the
lighting devices accordingly. The light output of the device 100 is
measured again and the process is repeated until the measured
tristimulus components represent a point within the predetermined
target area 675. At that point, the x, y and z tristimulus values
(where x+y+z=1) are used to determine the relative intensities of
the LED color groups in order to achieve the calibrated white
light.
[0061] A lighting system comprising multiple lighting devices in
accordance with the present invention will now be described.
[0062] FIG. 7 shows a block diagram of an exemplary lighting system
comprising lighting devices 100A and 100B and a central controller
700 coupled thereto. The central controller 700 can also be coupled
to a computer 300. Each of the lighting devices 100A and 100B can
be implemented as described above. A system with two lighting
devices is shown for simplicity. Larger systems with more lighting
devices can readily be implemented within the scope of the present
invention.
[0063] The exemplary embodiment of the central controller 700 shown
in FIG. 7 comprises an operator interface panel (OIP) 750, a power
supply 710, a plurality of switches 720 and a data selector 730.
The OIP 750 includes a microcontroller (not shown) which provides
the intelligence of the central controller 700 and provides a user
interface at the central controller. The lighting system can be
controlled from the OIP 750 or from the external computer 300. The
computer 300 can be temporarily coupled to the central controller
700 in order to program the OIP 750. Once programmed, the OIP 750
can then take over operation of the lighting system in accordance
with the downloaded program.
[0064] The central controller 700 is coupled to the lighting
devices 100A and 100B via respective data interfaces 120A, 120B. In
an exemplary embodiment, the interfaces 120A, 120B are
bidirectional serial data interfaces which conform to the RS-485
protocol. The lighting devices 100A and 100B are also coupled to
the power supply 710 which provides DC power to the lighting
devices. The power supply 710 may be coupled to a 115-120 V, 50-60
Hz AC power source (not shown) or other suitable power source.
[0065] The central controller 700 also includes interfaces 320A,
320B and 705 for coupling to the computer 300. The interfaces 320A
and 320B are similar to the interfaces 120A and 120B and are used
by the computer 300 to communicate with the lighting devices 100A
and 100B, respectively. The data selector 730 is coupled to the
lighting devices 100A, 100B via the interfaces 120A and 120B, to
the computer 300 via the interfaces 320A and 320B, and to ports A
and B of the OIP 750. The ports A and B of the OIP 750 are
compatible with the interfaces 120A and 120B. Under the control of
the OIP 750, the data selector 730 couples the lighting devices
100A, 100B to either the computer 300 or to the OIP 750. The
interfaces associated with the respective lighting devices 100A and
100B may be switched by the selector 730 in tandem or individually.
Thus, depending on the state of the selector 730, the lighting
devices 100A, 100B may communicate either with the computer 300 or
with the OP 750 over the interfaces 120A, 120B, respectively.
[0066] An additional data interface 705 couples the computer 300 to
the OIP 750. In an exemplary embodiment, the interface 705 is a
bidirectional serial data interface which conforms to the RS-232
protocol. The interface 705 is used to program the OIP 750 from the
computer 300 and to exchange data as needed.
[0067] As can be readily understood by a person of ordinary skill
in the art, the interfaces 120A, 120B, 320A, 320B and 705 can be
implemented in a variety of known ways, the specifics of which are
matters of design choice. Moreover, in alternate embodiments, these
data interfaces may be parallel interfaces or wireless (e.g., IR,
RF).
[0068] The switches 720 are used to input various information and
place the system into various modes under user control. For
example, in an aircraft application, the switches 720 may include a
decompression simulation activation switch which causes the system
to enter an emergency lighting mode. Another switch may be included
to simulate high-temperature conditions in which case the lighting
is dimmed to reduce the possibility of over-heating.
[0069] FIG. 8A shows the front panel of an exemplary embodiment of
an OIP 750. The OIP 750 includes a display 755 and a plurality of
buttons 761-768. A pair of buttons 761, 762 are used to scroll up
and down a menu structure that is displayed on the display 755 and
an ENTER button 763 is used to enter menu selections. A set of
buttons 765-768 are used to control the generation of white light.
FIG. 8B shows exemplary functions for the various buttons of the
OIP 750.
[0070] The lighting system comprising the lighting devices 100A and
100B can be controlled from the OIP 750 of the central controller
700. A computer 300 can be coupled to the central controller 700
via the interface 705 to program the operation of the lighting
system. The computer 300 can be loaded with software in accordance
with the present invention which allows a user to create programs
for the operation of the lighting system or to control the lighting
system directly. The programs can be developed on the computer 300
off-line and then downloaded to the central controller 700 when
coupled via the interface 750. The programs created on the computer
300 can control various operating characteristics of the lighting
system such as the colors, intensities and durations of light to be
emitted by the system. The computer 300 can also be used to create
scenes or sequences of scenes, including transitions between
scenes, fading, etc. The various lighting devices 100 coupled to
the lighting system can operate independently of each other thereby
allowing different lighting programs to be executed for different
lighting areas.
[0071] FIG. 9 illustrates an exemplary user interface as displayed
by the computer 300 programmed in accordance with the present
invention. In the embodiment shown, independent control of ceiling
and sidewall lighting is provided. A first area 500 of the display
is used to display and control parameters related to the ceiling
lighting and a second, similar area 600 is provided for the
sidewall lighting.
[0072] Each area 500, 600 includes three slider widgets 551, 552
and 553 with corresponding data windows 561, 562, 563. The sliders
551, 552, and 553 are used to control the relative intensities of
the red, green and blue light, respectively, emitted from the one
or more lighting devices 100 that provide the ceiling light (or
sidewall light, in the case of area 600). The data windows 561, 562
and 563 display numerical values corresponding to the settings
selected by the sliders and provide an alternate means of entering
and/or modifying said values. The widgets used in the present
invention such as the sliders and data windows are well known
functions and need no further description. Other suitable widgets
or constructs may also be used. In an alternative embodiment, a
two-dimensional color palette can be provided. The user can select
the desired color by placing a cursor over the desired color point
in the palette and selecting that point.
[0073] Below the color selection widgets within each area 500 (600)
are four windows 572-575 that allow the user to specify additional
parameters that affect the operation of the respective lighting
devices. A "transition type" window 572 allows the user to select,
from a pull down menu, one of five transition modes which determine
how the color of the light emitted will vary over a certain
transition period. The number of different colors which the emitted
light will take on over the transition period is specified by the
user via a "max colors" window 573. In an exemplary embodiment, 1
to 10 colors can be specified via window 573. Each of these colors
is automatically assigned a number between 1 and the number
specified in the window 573, with the numbers being assigned in the
order of appearance. Each color can be selected by entering its
assigned number in the "active color" window 574. The color
selected via the window 574 can be adjusted via the widgets 551-553
or 561-563. Finally, a "time" window 575 is provided whereby the
user can specify the duration of the transition period.
[0074] To better illustrate the operation of this aspect of the
present invention, an exemplary scene programming sequence will now
be described. The user first enters a name for the scene to be
created using a label window 800. Using the sliders 551-553 (or
windows 561-563) the user specifies a first color to be generated
in a color transition procedure which may have one or more steps.
The user then selects one of five available transition types which
are illustrated schematically in FIGS. 10A through 10E. The first
available transition type referred to as "single point" yields a
smooth transition from the present color to the specified color
(color 1) in one continuous step, as represented in FIG. 10A. In
this mode, the "max colors" window 573 and "active color" window
574 are fixed at one and cannot be altered by the user.
[0075] The second available transition type referred to as the
"multipoint" transition mode is illustrated in FIG. 10B. This mode
yields a smooth transition from selected color to selected color in
a number of steps divided evenly over the time period specified in
the time window 575. The number of steps (colors) through which
this mode transitions is selected via the max colors window 573.
FIG. 10B illustrates the case of four colors.
[0076] The third available transition type, referred to as the
"ping pong" transition mode is illustrated in FIG. 10C. In this
mode, a multipoint transition is followed by a multipoint
transition through the same colors in reverse order.
[0077] The fourth available transition type, referred to as the
"repeating" transition mode is illustrated in FIG. 10D. In this
mode, a multipoint transition is repeated in the same order.
[0078] The last available transition type, the "stop and go"
transition mode, is illustrated in FIG. 10E. This mode yields
abrupt transitions from selected color to selected color. Each
selected color is emitted for a period of time equal to the time
period selected via the widget 575 divided by the number of colors
selected via the widget 574.
[0079] The settings programmed via the screen of FIG. 9 can be
given a name or label which is entered in the label window 800.
During normal operation of the lighting system, the programmed
settings can be invoked via the OIP 750 using the label provided in
the label window 800. When a settings label is selected at the OIP
750, the settings associated with the label are put into
effect.
[0080] As shown in FIG. 9, a set of "page control" buttons 801-805
is provided for controlling the programming of additional scenes,
each of which can be programmed as described. When the "Add" button
805 is pressed, a new scene is created. A scene can be deleted with
the "delete" button 801 and the previous and next buttons 802 and
803, respectively, can be used to sequence through multiple scenes.
The settings window for each scene also can be accessed by a tab
820 arranged proximate to the top of the main window. In an
exemplary embodiment, up to 15 scenes can be created and programmed
individually as described. The sequence of scenes can be saved as a
program on the computer 300. The program can then be downloaded
from the computer 300 to the central controller 700 via the
interface 705 and then executed by the lighting system, with or
without the computer 300 coupled thereto. The execution of the
downloaded program can be controlled by a user via the OIP 750.
[0081] The lighting system can be programmed to enter different
modes under certain conditions. For example, during an emergency,
the lighting system can turn off all LEDs with the exception of a
subset of red LEDs located proximate to an emergency exit door. In
another embodiment, the red LEDs can be sequenced so as to indicate
the path to an emergency exit door. Other conditions that can cause
the system to enter a special mode of operation may include, among
others, the loss of main power and the switching over to backup
power.
[0082] Several exemplary physical configurations of the lighting
devices of the present invention will now be described.
[0083] FIG. 11 is a perspective view of the exterior of a first
exemplary embodiment of a lighting device 1100 in accordance with
the present invention. FIG. 12 is a view of cross section A-A of
the device of FIG. 12. As shown, the device 1100 has a generally
linear configuration with a generally rectangular cross-section.
The device 1100 comprises an extruded metallic (e.g., aluminum)
housing 1101 which in combination with a side cover 1102 forms a
first compartment containing a circuit board 1103 for the control
module and a circuit board 1104 for the power module. The boards
1103 and 1104 are arranged end-to-end in the same plane against a
central wall 1101a of the housing extrusion 1101 with a layer of
thermal padding 1105 arranged between the boards and the housing
extrusion. The thermal padding 1105 may comprise any suitable
material for conducting heat generated by the boards to the housing
extrusion.
[0084] A third circuit board, an LED board 1106, is supported on a
platform-like structure 1101b which protrudes substantially
perpendicularly from the central wall 1101a of the housing
extrusion 1101. A layer of thermal padding 1107 is arranged between
the bottom of the LED board 1106 and the top of the platform-like
structure 1101b for conducting heat from the LED board to the
housing extrusion 1101. The LED board 1106 preferably includes one
or more layers of metallic material (not shown) as well as islands
of metallic material (not shown) on its top and bottom surfaces for
the purpose of conducting heat away from the LEDs to the
platform-like structure 1101b of the housing extrusion through the
thermal padding 1107. The housing extrusion 1101 preferably
includes groove-like features 1101d which increase its surface area
and thus aid in the dissipation of heat from the housing.
[0085] A row of LEDs 1108 is arranged substantially down the center
of the upper surface of the LED board 1106 along the length of the
LED board. (See FIG. 2 for a plan view of the LED board.) As shown
in FIG. 12, a reflector 1109 is arranged on either side of the row
of LEDs. The two reflectors 1109 form a trough between them having
a generally parabolic cross-section with the row of LEDs 1108 being
arranged at the bottom of the trough. Light emitted from the LEDs
1108 is reflected by the inner surfaces of the reflectors 1109. The
inner surfaces of the reflectors are smooth and may be specular. An
optional cover plate 1120 may be arranged between the reflectors
1109 across the trough formed therebetween. The cover plate 1120
may be transparent or translucent and may be tinted.
[0086] The reflectors 1109 are attached to the LED board 1106, such
as by riveting or other appropriate attachment arrangement, thereby
forming an LED board sub-assembly. The right edge of the LED board
sub-assembly is retained by a lip 1101c protruding from the central
wall 1101a of the housing extrusion whereas the left edge of the
LED board sub-assembly is retained by a plurality of clips 1110
arranged along the length of the fixture.
[0087] As shown in FIG. 11, end caps 1111 are attached to the ends
of the housing extrusion 1101 for fixedly mounting the device 1100
such as to the interior of an aircraft cabin.
[0088] In an exemplary embodiment, the device 1100 is one to five
feet in length. The cross-sectional dimensions of the exemplary
device shown are approximately 1.75".times.1.75".
[0089] FIGS. 13 and 14 show a further exemplary embodiment of a
lighting device 1300 in accordance with the present invention. The
various components of the device 1300 are similar to those of
device 1100, with the primary differences being the shape of the
metallic housing extrusion 1301 and the arrangement of components.
As shown in FIG. 14, the housing extrusion 1301 of device 1300
comprises an upper horizontal wall 1301a, with a vertical wall
1301b extending downwards from the right edge of the upper wall and
a bottom wall 1301c extending horizontally from the bottom edge of
the vertical wall. Cooling fins 1301d may be formed in the outer
surface of the upper wall 1301a and serve to dissipate heat from
the device to the surrounding air.
[0090] An LED board assembly 1306, 1308, 1309, similar to that of
device 1100, is removably attached by multiple clips 1310, in a
similar manner, to the outer surface of the upper wall adjacent to
the right edge of the upper wall.
[0091] A control board 1303 and a power board 1304 are arranged
end-to-end against the inner surface of the upper wall.
[0092] Exemplary cross-sectional dimensions of device 1300 are
approximately 1.5" high and 2" wide.
[0093] FIG. 15 shows a cross-section of an aircraft 1500
illustrating exemplary placements for lighting devices 100 of the
present invention for illuminating the passenger cabin 1510 of the
aircraft. In the exemplary arrangement shown, a lighting device
100C is placed in the ceiling of the passenger cabin and provides
ceiling lighting. Lighting devices 100L and 100R are placed to
illuminate the left and right sidewalls, respectively, of the
passenger cabin. The three devices 100C, 100L and 100R can be
coupled to one or more central controllers 700 and programmed as
described above.
[0094] Exemplary embodiments of reflector arrangements in
accordance with the present invention will now be described in
connection with FIGS. 16-16C. FIGS. 16A-16C show cross-sectional
views of three different reflector arrangements for use in
different applications. In FIG. 16A, reflectors 1640 and 1630 are
arranged on either side of a row of LEDs 1620 arranged along the
length of a circuit board 1610. As shown in FIG. 16A, the
cross-sections of the reflectors 1630 and 1640 are mirror images of
each other. Light is emitted from the LEDs 1620 and reflected by
the reflectors 1630, 1640 in a pattern that is symmetric about the
LEDs. A normal line N corresponds substantially to the center of
the light that is emitted from the LEDs. In an exemplary
embodiment, the cross-section of the pattern of light emitted by
the LED/reflector assembly has an included angle of 60 degrees,
with 30 degrees on each side of the normal line N. Such a pattern
is well suited for illuminating the sidewall of an aircraft cabin,
for example.
[0095] In the arrangement shown in FIG. 16B, the reflector 1630 is
substantially shorter than the reflector 1640. As a result, light
is emitted from the LEDs 1620 and reflected by the reflectors 1630,
1640 in a pattern that is asymmetric about the LEDs. In an
exemplary embodiment, the cross-section of the pattern of light
emitted by the LED/reflector assembly has an included angle of 105
degrees, with 30 degrees on the left side of the normal line N and
75 degrees on the right side. Such a pattern is well suited for
ceiling illumination in an aircraft cabin, for example.
[0096] In the arrangement shown in FIG. 16C, the reflectors 1630
and 1640 have mirror-image cross-sections but are both
substantially shorter than the reflectors of FIG. 16A. As a result,
light is emitted from the LEDs 1620 and reflected by the reflectors
1630, 1640 in a pattern that is symmetric about the LEDs but which
has a wider included angle than the embodiment of FIG. 16A. In an
exemplary embodiment, the cross-section of the pattern of light
emitted by the LED/reflector assembly has an included angle of 150
degrees, with 75 degrees on each side of the normal line N. Such a
pattern is well suited for ceiling illumination in an aircraft
cabin, for example.
[0097] In systems such as that of the present invention in which
light of different colors is emitted from different point sources
(LEDs) it is desirable to thoroughly blend the different color
light to prevent the appearance of multiple light sources of
different colors. For confined spaces such as an aircraft cabin,,
it is desirable that light rays of different colors be perceived as
mixed at relatively small distances from the light fixture: e.g.,
one inch, as opposed to several yards for large outdoor display
applications. To promote the mixing of light of different colors
emitted from different point sources, the reflective surfaces of
the reflectors 1630, 1640 preferably have a flat white finish,
which tends to scatter the reflected light in multiple directions.
A person looking at the lighting device will see the scattered
light, which is mixed, and not the discrete LED point sources from
which the light originated.
[0098] As discussed above in connection with FIGS. 12 and 14, a
cover 1120 (1320) may be optionally arranged between the reflectors
1109 (1309) arranged on either side of the LEDs. The cover may be a
lens which helps promote light mixing. As shown in FIGS. 17A and
17B, a ray of light passing through the cover 1720 is diffused into
a cone, with a circular cross-section (FIG. 17A) or an elliptical
cross-section (FIG. 17B). In an exemplary embodiment, the cover
1720 can be implemented with a sheet of polycarbonate material
having a thickness of 0.030 inches.
[0099] The present invention is not to be limited in scope by the
specific embodiments described herein. Indeed, various
modifications of the invention in addition to those described
herein will become apparent to those skilled in the art from the
foregoing description and the accompanying figures. Such
modifications are intended to fall within the scope of the appended
claims.
[0100] It is further to be understood that all values are to some
degree approximate, and are provided for purposes of
description.
[0101] The disclosures of any patents, patent applications, and
publications that may be cited throughout this application are
incorporated herein by reference in their entireties.
* * * * *